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JOSEPH F. HARCOURT, CF CINCINNATI, OHIO.

Letters Patent No.4 78,663, dated June 9, 1868.

IMPROVEMENT IN TACKLE-BLOCKS.

@in Stimuli tint-ttt tu it vtinte tttett nteut mit mating part uf tigtsame.

To WnoM rr MAY ooNcnRN:

Be it known that I, JOSEPH F. HARCOURT, of Cincinnati, Hamilton county,Ohio, have invented a new and useful Improvement in Sheave or.Tackle-Blocks; and I hereby declare the following to be a full,clear,and exact description thereof, reference being had to the accompanyingdrawings, making part of this specification. l

This is an improvement inV the class of inside iron-strappedtackle-blocks, having two or more sheaves, whereby the pin dr axleviseifectually supported without detraoting from the strength ofthepartitions.

Figure 1 isa Vp:.trtially-sectioniaed front elevation of a triplesheave-block, embodying my improvements.

Figure 2 is a. similar `View' of a double sheave-block.

'Figure 3 is a partially-sectioni'zed side elevation of my improvedblock for tivo or more sheaves.

' Figure 4 is a cross-section of one of the partitions detached.

Inside iron-strapped tackle-blocks as heretofore constructed have provedinsuiicient for the rough usage to l which such are often subjected,because the partitions `have either been ,separated each one into twoparts by the strap, and liable to be torn apart so as 'to expose thesheaves to fracture, and the rope to be frayed out or run off, thusdestroying the utility ofthe block, or where the partitions have notbeen so separated, then the pin,

having been inadequately supported, in consequence of havingy only awooden bearing next the sheaves, has become bent or broken in use.

In my form of block, the partitions can be made of any desiredthickness, without either increasing the weight and thickness ofthestraps or the distance of the sheaves'therefrom, and besides being inone piece, are susceptible of additional strength by theiintroduction ofcounter-rivets when desired. I

The wooden portion of my framework or block proper consists of the usualnumber of cheeks or sides, A, partitions C, and end-piece`s B. i

The straps D D are broad in the direction parallel with the sheaves E,and thin in the plane of the pinarA axle F, and are iet into grooves, GrGr', made in the sides of the cheeks 4and partitions, respectively, soasfor that part of them near the sheaves to be ush, or nearly so, with thesaid cheeks and partitions, and while permitting earch cheek'andpartition-to be in one continuous piece, also bringing the metal strapclose up to.the sheave, se as eiieetually to support the pin. v

The inner strap is turned over the outer strap, so as to form aconvenient eye, II, for the insertion of hoek or cordage-lashing, andfor a triple pulley; The ends of the inner strap, D', are bifurcated, soas to extend on each side of the two partitions,`as at I, iig. 1. Y

The main rivets, J, pass from side to side entirely through the cheeks,partitions, and end-pieces, but are not, asin other inside-strap blocks,the only-means of junction ofvthese par-ts, because each partition, aswell as cheek, is in one unbroken piece, and, furthermore, issusceptibleV of being secured by'eross or counter-rivets, L, which maybe passed entirely through each cheek and partition, from edge to. edge,without interfering with the straps.

The central strap may, when required, be extended down, as at M, for theattachment of a. becket, N.

I claim herein as new and of my invention- A two or more sheave-tackleblock, whose partitions, C, extend fromvside toside in Vone piece, andare formed with grooves, G', in their sides, for thereception of theinner forked straps D', all as herein described, for the purposespecied. I

In testimony of which invention, I hereunto set my hand. l JOSEPHA F.HARCOURT.

Witnesses:

Geo. H. KNIGHT, JAMES H. LAYMAN.

